From 16d84f499f85a375ea38a7e9971aaa64a0cc366a Mon Sep 17 00:00:00 2001
From: Rick Choi <jinhwanlazy@gmail.com>
Date: Tue, 24 Dec 2024 00:06:35 +0900
Subject: [PATCH] fix bug that trail not visible when vertical move

---
 kitty/trail_fragment.glsl | 3 +--
 1 file changed, 1 insertion(+), 2 deletions(-)

diff --git a/kitty/trail_fragment.glsl b/kitty/trail_fragment.glsl
index 6b2fee162..31d9523e6 100644
--- a/kitty/trail_fragment.glsl
+++ b/kitty/trail_fragment.glsl
@@ -10,8 +10,7 @@ void main() {
     float opacity = trail_opacity;
     // Dont render if fragment is within cursor area
     float in_x = step(cursor_edge_x[0], frag_pos.x) * step(frag_pos.x, cursor_edge_x[1]);
-    opacity *= 1.0f - in_x;
     float in_y = step(cursor_edge_y[0], frag_pos.y) * step(frag_pos.y, cursor_edge_y[1]);
-    opacity *= 1.0f - in_y;
+    opacity *= 1.0f - in_x * in_y;
     final_color = vec4(trail_color, opacity);
 }